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This work investigates microstructure characterization and mechanical properties of Aluminum alloy fabricated by additive friction stir deposition (AFSD). Microstructure characterize of the Aluminum alloy 5B70 base material (BM) and build were compared using optical microscope (OM) and electron back scattered diffraction (EBSD). Hardness distribution in the direction perpendicular to the cross-section of deposited area was measured and the pattern was evaluated. Tensile tests were performed on the BM and the deposition using digital image correlation (DIC), and the stress distribution states of the specimens were analyzed in real time. After the tensile tests, the fracture micromorphology was characterized using scanning electron microscope (SEM). The results show that a high degree of recrystallization of the grains in the deposition zone occurs and ne equiaxed grains are formed, which are oriented differently. In tensile tests on the deposition, it was found that the strength of the deposition was signi cantly lower compared to the BM, but its toughness was signi cantly higher. And there is a signi cant anisotropy in the mechanical properties of the deposition.

The low-cost Ti-6Al-0.4V-1.2Fe alloy was subjected to isothermal compression experiments on the Gleeble 3800, and the deformation temperature was 775°C∼975°C and the strain rate was 0.01 s−1∼10 s−1. Based on the experimental data on thermal deformation, the microstructure evolution was studied and the constitutive equation was developed. The experimental results show that the flow stress increased with increasing deformation temperature and with the increase of the strain rate; the optimal deformation temperature of Ti-6Al-0.4V-1.2Fe alloy is 820°C∼950°C, and the strain rate is 0.01 s−1∼0.32 s−1; During hot deformation, the primary softening mechanism of this alloy is continuous dynamic recrystallisation. Compared with Ti-6Al-4V, the Ti-6Al-0.4V-1.2Fe alloy has better hot workability and better plasticity. Highlights A newly low-cost Ti-6Al-0.4V-1.2Fe alloy was designed based on the Kβ stability coefficient method, and the β stability coefficient was the same as that of Ti-6Al-4V. A study on the microstructure evolution in the process of hot deformation between Ti-6Al-0.4V-1.2Fe and Ti-6Al-4V alloys. A study on microstructure evolution and hot working process of a newly low-cost Ti-6Al-0.4V-1.2Fe alloy.